Advanced Research Systems - 800K Cryostat Interface

DESCRIPTION

The 800 K Interface mounts on the cooler and contains an internal mechanical thermal switch which protects the cold end from excessive heat while experiments are carried out at elevated temperatures. The interface mounts between the cryostat cold end sample mount and the sample holder allowing compatibility in upgrading existing systems or for use with new systems.

An electrical thermal switch opens the heater circuit to protect the cold end in the event that the cooler is inavertantly switched off and begins to overheat. Heaters and temperature sensors are integrated together to provide accurate temperature monitoring and control to 800 K.

SPECIFICATIONS

Maximum Temperature
800K

Maximum Steady State Temperature
800K for all cyostats except those listed below
700K for 50 Hz models of all DE-202 cryostats

Heater Input
20 W at 800K

Typical Heating Ramp Rate
17.5 K / minute

Heater Impedance
50 ohms

Mechanical Loading
The interface will support a maximum of 1.0 Kg (2.2 lb) or a moment of 0.33 N-m (3.0 in-lb) applied at the sample mount thread.

Instrumentation
Calibrated sensors can be provided to cover the complete temerature range from the cryostat minimum temperature to 800K with accuracy of +/- 200mK (+/- 50mK below 480K). Contact ARS, Inc. for more information on instrumentation packages..

800K Iterface - Affect on Cold End Length

Closed cycle cold ends constructed for use with laboratory shrouds and radiation shields are normally supplied with a copper instrumentation tip, which can be removed and replaced by high temperature interfaces. Use the following table as a guidline. Contact ARS, Inc. for help in verifying dimensions.

Cryostat Type
DE-202 / DE-202N closed cycle	Replaces instrumentation tip - no change in overall length.
DE-202G closed cycle	Replaces instrumentation tip - no change in overall length.
DE-202B closed cycle	This cryostat has no instrumentation tip - add 1.44 inch (36.6 mm) to cryostat second stage length.
DE-204 / DE-204N closed cycle	Can replace 1.13 inch (28.7 mm) instrumentation tip. With no instrumentation tip, add 0.31 inch (7.9 mm) to second stage length. With instrumentation tip in place, add 1.44 inch (36.6 mm) to cryostat second stage length.
DE-204B closed cycle	This cryostat has no instrumentation tip - add 1.44 inch (36.6 mm) to cryostat second stage length.
LT-3-110 open cycle	Add 1.44 inch (36.6 mm) to minimum cryostat length - minimum length becomes 6.94 inch (176 mm).
LT-3B	Add 1.44 inch (36.6 mm) to minimum cryostat length - minimum length becomes 5.94 inch (151 mm). Requires 1.50 inch (38.1 mm) OD radiation shield.

800K Interface
Optical Sample Holder / 800K Interface / DE-202	* see table below for affect on cold end length